Muscular involvement with Echinococcusgranulosus is rare, even in endemic countries where the frequency is estimated to be less than 3%, particularly in the countries of the Mediterranean basin, North Africa and Latin America. We report the rare observation of a hydatid cyst of the anterior thigh room in a 26-year-old patient of rural origin with no significant history and was hospitalized in our department for the exploration of a tumefaction Of the antirior surface of the left thigh appeared gradually and insidiously for 6 months. Magnetic resonance imaging (MRI) showed an oval mass evoking an intramuscular hydatid cyst and its relationship to neighboring structures. She underwent surgical excision under locoregional anesthesia. Solitary hydatid localization in muscle tissue is exceptional, but useful to know. Its diagnosis is often delayed, its treatment is surgical, but recurrences are possible.